Stool



FIG. 1 is a top perspective view of a stool showing my new design therefor;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front elevational view, the rear view being a mirror image thereof;

FIG. 4 is a right side elevational view, the left side being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

Throughout the drawings, broken lines show environment and form no part of the claimed design. 

CLAIM The ornamental design for a stool, as shown and described. 